21095222839 has 2 divisors, whose sum is σ = 21095222840. Its totient is φ = 21095222838.

The previous prime is 21095222807. The next prime is 21095222843. The reversal of 21095222839 is 93822259012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21095222839 - 2⁵ = 21095222807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21095222795 and 21095222804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21095222849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547611419 + 10547611420.

It is an arithmetic number, because the mean of its divisors is an integer number (10547611420).

Almost surely, 2^21095222839 is an apocalyptic number.

21095222839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095222839 is an equidigital number, since it uses as much as digits as its factorization.

21095222839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 21095222839 in words is "twenty-one billion, ninety-five million, two hundred twenty-two thousand, eight hundred thirty-nine".